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Myocardial viability

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https://www.readbyqxmd.com/read/29212219/microrna-126a-5p-enhances-myocardial-ischemia-reperfusion-injury-through-suppressing-hspb8-expression
#1
Bimei Jiang, Yanjuan Liu, Pengfei Liang, Yuanbin Li, Zhenguo Liu, Zhongyi Tong, Qinglan Lv, Meidong Liu, Xianzhong Xiao
Previously, we found several genes are involved in myocardial ischemia-reperfusion (M-I/R) injury. In this report, we first developed a mouse model of M-I/R injury and demonstrated microRNA-126a-5p was associated with the M-I/R injury by using high-throughput microRNA expression analysis. We further investigated the expression and function of microRNA-126a-5p during mouse M-I/R injury. We observed high expression of microRNA-126a-5p in the M-I/R mice and increased levels of LDH and CK-MB (damage markers) in the serum...
November 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/29208472/role-of-transglutaminase-2-in-a1-adenosine-receptor-and-%C3%AE-2-adrenoceptor-mediated-pharmacological-pre-and-post-conditioning-against-hypoxia-reoxygenation-induced-cell-death-in-h9c2-cells
#2
Falguni S Vyas, Carl P Nelson, John M Dickenson
Pharmacologically-induced pre- and post-conditioning represent attractive therapeutic strategies to reduce ischaemia/reperfusion injury during cardiac surgery and following myocardial infarction. We have previously reported that transglutaminase 2 (TG2) activity is modulated by the A1 adenosine receptor and β2-adrenoceptor in H9c2 cardiomyoblasts. The primary aim of this study was to determine the role of TG2 in A1 adenosine receptor and β2-adrenoceptor-induced pharmacological pre- and post-conditioning in the H9c2 cells...
December 2, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29207102/lncrna-tug1-serves-an-important-role-in-hypoxia-induced-myocardial-cell-injury-by-regulating-the-mir%C3%A2-145%C3%A2-5p%C3%A2-binp3-axis
#3
Zhongwei Wu, Shengji Zhao, Chunfu Li, Chaoquan Liu
The aim of the present study was to investigate the function of long non‑coding RNA TUG1 in hypoxia‑induced myocardial cell injury and to explore the potential molecular mechanisms. The cardiomyocyte cell line H9c2 was cultured under hypoxic and normoxic conditions. TUG1 expression under hypoxic conditions was then detected. The effects of TUG1 overexpression on viability, apoptosis, migration and invasion were assayed. In addition, the microRNA (miR)‑145‑5p expression was detected. Following H9c2 cell transfection with miR‑145‑5p mimics, the H9c2 cell viability, apoptosis, migration and invasion were also detected...
November 20, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29207024/geraniin-protects-bone-marrow%C3%A2-derived-mesenchymal-stem-cells-against-hydrogen-peroxide%C3%A2-induced-cellular-oxidative-stress-in-vitro
#4
Dan Huang, Li Yin, Xinxin Liu, Bo Lv, Zulong Xie, Xuedong Wang, Bo Yu, Yao Zhang
Administration of bone marrow‑derived mesenchymal stem cells (MSCs) has emerged as a potential therapeutic approach for the treatment of myocardial infarction (MI). However, the increase in reactive oxygen species (ROS) in ischemic cardiac tissue compromises the survival of transplanted MSCs, thus resulting in limited therapeutic efficiency. Therefore, strategies that attenuate oxidative stress‑induced damage and enhance MSC viability are required. Geraniin has been reported to possess potent antioxidative activity and exert protective effects on numerous cell types under certain conditions...
November 21, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29192208/endogenous-annexin-a1-regulates-haematopoietic-stem-cell-mobilisation-and-inflammatory-response-post-myocardial-infarction-in-mice-in-vivo
#5
Cheng Xue Qin, Siobhan B Finlayson, Annas Ai-Sharea, Mitchel Tate, Miles J De Blasio, Minh Deo, Sarah Rosli, Darnel Prakoso, Colleen J Thomas, Helen Kiriazis, Eleanor Gould, Yuan H Yang, Eric F Morand, Mauro Perretti, Andrew J Murphy, Xiao-Jun Du, Xiao-Ming Gao, Rebecca H Ritchie
Endogenous anti-inflammatory annexin-A1 (ANX-A1) plays an important role in preserving left ventricular (LV) viability and function after ischaemic insults in vitro, but its long-term cardioprotective actions in vivo are largely unknown. We tested the hypothesis that ANX-A1-deficiency exaggerates inflammation, haematopoietic stem progenitor cell (HSPC) activity and LV remodelling in response to myocardial ischaemia in vivo. Adult ANX - A1 -/- mice subjected to coronary artery occlusion exhibited increased infarct size and LV macrophage content after 24-48 h reperfusion compared with wildtype (WT) counterparts...
November 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29189769/preparation-of-viable-adult-ventricular-myocardial-slices-from-large-and-small-mammals
#6
Samuel A Watson, Martina Scigliano, Ifigeneia Bardi, Raimondo Ascione, Cesare M Terracciano, Filippo Perbellini
This protocol describes the preparation of highly viable adult ventricular myocardial slices from the hearts of small and large mammals, including rodents, pigs, dogs and humans. Adult ventricular myocardial slices are 100- to 400-μm-thick slices of living myocardium that retain the native multicellularity, architecture and physiology of the heart. This protocol provides a list of the equipment and reagents required alongside a detailed description of the methodology for heart explantation, tissue preparation, slicing with a vibratome and handling of myocardial slices...
December 2017: Nature Protocols
https://www.readbyqxmd.com/read/29189425/remodeling-failing-human-myocardium-with-hybrid-cell-matrix-and-transmyocardial-revascularization
#7
Ryan J Avery, Soojie K Yu, Gopi Cherukuri, Ray B Runyan, John Konhilas, Zain I Khalpey
Given the limited treatment options for advanced heart failure, the intrinsic regenerative properties of stem cells have been evaluated for myocardial remodeling. Previous stem cells techniques for myocardiocyte remodeling have been limited by the low cellular retention. Presented is a hybrid approach for remodeling infarcted myocardium through implantation of allogeneic human amniotic fluid-derived mesenchymal stem cells within micronized human allograft-derived liquid matrix during the performance of transmyocardial revascularization (TMR)...
November 14, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29184499/aliskiren-improves-ischemia-and-oxygen-glucose-deprivation-induced-cardiac-injury-through-activation-of-autophagy-and-amp-activated-protein-kinase
#8
Ming-Hsien Chiang, Chan-Jung Liang, Chen-Wei Liu, Bo-Jhih Pan, Wen-Ping Chen, Yi-Fan Yang, I-Ta Lee, Jaw-Shiun Tsai, Chiang-Wen Lee, Yuh-Lien Chen
Aliskiren is a direct renin inhibitor that has been effective in anti-hypertension. We investigated whether aliskiren could improve the ischemia-induced cardiac injury and whether the autophagy was involved in this effect. A myocardial infarction (MI) model was created by the ligation of the left anterior coronary artery in C57J/BL6 mice. They were treated for 1, 3, 7, and 14 days with vehicle or aliskiren (25 mg/kg/day via subcutaneous injection). In vivo, the MI mice exhibited worse cardiac function by echocardiographic assessment and showed larger myocardial scarring by light microscopy, whereas aliskiren treatment reversed these effects, which were also associated with the changes in caspase-3 and Bcl-2 expression as well as in the number of apoptotic cells...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29179202/long-non-coding-rna-h19-protects-h9c2-cells-against-hypoxia-induced-injury-by-targeting-microrna-139
#9
Li-Cheng Gong, Hai-Ming Xu, Gong-Liang Guo, Tao Zhang, Jing-Wei Shi, Chang Hong
BACKGROUND/AIMS: Acute myocardial infarction (AMI) occurs when blood supply to the heart is diminished (ischemia) for long time; ischemia is primarily caused due to hypoxia. The present study evaluated the effects of long non-coding RNA H19 on hypoxic rat H9c2 cells and mouse HL-1 cells. METHODS: Hypoxic injury was confirmed by measuring cell viability, migration and invasion, and apoptosis using MTT, Transwell and flow cytometry assays, respectively. H19 expression after hypoxia was estimated by qRT-PCR...
November 24, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29179177/permanently-hypoxic-cell-culture-yields-rat-bone-marrow-mesenchymal-cells-with-higher-therapeutic-potential-in-the-treatment-of-chronic-myocardial-infarction
#10
Yihua Liu, Xiaoxi Yang, Pablo Maureira, Aude Falanga, Vanessa Marie, Guillaume Gauchotte, Sylvain Poussier, Frederique Groubatch, Pierre-Yves Marie, Nguyen Tran
BACKGROUND: The mismatch between traditional in vitro cell culture conditions and targeted chronic hypoxic myocardial tissue could potentially hamper the therapeutic effects of implanted bone marrow mesenchymal stem cells (BMSCs). This study sought to address (i) the extent of change to BMSC biological characteristics in different in vitro culture conditions and (ii) the effectiveness of permanent hypoxic culture for cell therapy in treating chronic myocardial infarction (MI) in rats...
November 27, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29178928/microrna-133-overexpression-promotes-the-therapeutic-efficacy-of-mesenchymal-stem-cells-on-acute-myocardial-infarction
#11
Yueqiu Chen, Yunfeng Zhao, Weiqian Chen, Lincen Xie, Zhen-Ao Zhao, Junjie Yang, Yihuan Chen, Wei Lei, Zhenya Shen
BACKGROUND: Our study aim was to evaluate the therapeutic efficacy and mechanisms of miR-133-overexpressing mesenchymal stem cells (MSCs) on acute myocardial infarction. METHODS: Rat MSCs were isolated and purified by whole bone marrow adherent culturing. After transfection with the agomir or antagomir of miR-133, MSCs were collected for assay of cell vitality, apoptosis, and cell cycle progression. At the same time, exosomes were isolated from the supernatant to analyze the paracrine miR-133...
November 25, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29176139/preoperative-evaluation-and-midterm-outcomes-after-the-surgical-correction-of-anomalous-origin-of-the-left-coronary-artery-from-the-pulmonary-artery-in-50-infants-and-children
#12
Hui-Li Zhang, Shou-Jun Li, Xu Wang, Jun Yan, Zhong-Dong Hua
BACKGROUND: Anomalous origin of the left coronary artery (LCA) from the pulmonary artery (ALCAPA) is a rather rare congenital anomaly that has a profound effect on heart function. This study aimed to retrospectively illustrate the perioperative clinical features, therapy experience, and midterm outcomes after surgical correction, and to determine the value of left ventricular ejection fraction (LVEF) and myocardial viability in differentiating critically ill patients among infants and children with ALCAPA...
December 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/29175072/capsaicin-prevents-mitochondrial-damage-protects-cardiomyocytes-subjected-to-anoxia-reoxygenation-injury-mediated-by-14-3-3%C3%AE-bcl-2
#13
Jiyi Huang, Zhantu Liu, Ping Xu, Zeyu Zhang, Dong Yin, Jichun Liu, Huan He, Ming He
Capsaicin(Cap) is an active component of chili peppers that is extracted from capsicum plants. Recent studies have reported that Cap can ameliorate myocardial ischemia/reperfusion(I/R) injury. Mitochondria play an important role in pathways of apoptosis induced by myocardial I/R injury. However, the underlying mechanisms of Cap that improve mitochondrial function during I/R injury is not yet understood. The aim of this study was to evaluate whether Cap regained normal mitochondrial function in myocardial I/R injury, and to further explore the underlying mechanisms of action involved...
November 21, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29168158/assessment-of-attenuation-correction-for-myocardial-pet-imaging-using-combined-pet-mri
#14
Martin Lyngby Lassen, Sazan Rasul, Dietrich Beitzke, Marie-Elisabeth Stelzmüller, Jacobo Cal-Gonzalez, Marcus Hacker, Thomas Beyer
OBJECTIVE: To evaluate the frequency of artifacts in MR-based attenuation correction (AC) maps and their impact on the quantitative accuracy of PET-based flow and metabolism measurements in a cohort of consecutive heart failure patients undergoing combined PET/MR imaging. METHODS: Myocardial viability studies were performed in 20 patients following a dual-tracer protocol involving the assessment of myocardial perfusion ((13)N-NH3: 813 ± 86 MBq) and metabolism ((18)F-FDG: 335 ± 38 MBq)...
November 22, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/29165728/cardioprotective-effect-of-hydroxysafflor-yellow-a-via-the-cardiac-permeability-transition-pore
#15
Gavin A Huber, Sydney M Priest, Timothy P Geisbuhler
Myocardial ischemia damages cardiac myocytes in part via opening of the mitochondrial permeability transition pore. Preventing this pore's opening is therefore a useful therapeutic goal in treating cardiovascular disease. Hydroxysafflor yellow A has been proposed as a nontoxic alternative to other agents that modulate mitochondrial permeability transition pore opening. In this study, we proposed that hydroxysafflor yellow A prevents mitochondrial permeability transition pore formation in anoxic cardiac myocytes, and thus protects the cell from damage seen during reoxygenation of the cardiac myocytes...
November 17, 2017: Planta Medica
https://www.readbyqxmd.com/read/29160621/magnetic-resonance-imaging-in-heart-failure-including-coronary-imaging-numbers-facts-and-challenges
#16
EDITORIAL
Lisa Adams, Michel Noutsias, Boris Bigalke, Marcus R Makowski
Coronary artery disease (CAD) is a major risk factor for the incidence and progression of heart failure (HF). HF is characterized by a substantial morbidity and mortality and its lifetime risk is estimated at approximately 20% for men and women. As patients are in most cases identified only after developing overt clinical symptoms, detecting early stages of CAD and HF is of paramount importance. Due to its non-invasiveness, excellent soft-tissue contrast, high spatial resolution, and multiparametric nature, cardiovascular magnetic resonance (CMR) imaging has emerged as a promising radiation-free technique to assess a wide range of cardiovascular diseases such as CAD or HF, enabling a comprehensive evaluation of myocardial anatomy, regional and global function, and viability with the additional benefit of in vivo tissue characterization...
November 21, 2017: ESC Heart Failure
https://www.readbyqxmd.com/read/29152646/naringin-protects-myocardial-cells-from-doxorubicin%C3%A2-induced-apoptosis-partially-by-inhibiting-the-p38mapk-pathway
#17
Chun-Yan Jian, Han-Bin Ouyang, Xian-Hong Xiang, Jia-Li Chen, Yong-Xin Li, Xin Zhou, Jin-Yang Wang, Yang Yang, En-Yi Zhong, Wen-Hua Huang, Hong-Wu Zhang
Doxorubicin (DOX) has been widely used to treat cancers as a first‑line antitumor drug. However, it causes severe, irreversible, dose‑dependent cardiotoxicity. To evaluate the protective effects of naringin (NRG) on cardiotoxicity, the authors investigated the molecular mechanism of the p38MAPK signaling pathway. H9c2 cells were treated for 24 h by using 5 µmol/l DOX without or with being pretreated by 1 µM NRG for 150 min or by 3 µM SB203580 for 60 min. Cell viability was detected by cell counting kit‑8 assay...
October 19, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29150492/predictors-of-mortality-in-patients-with-severe-ischemic-cardiomyopathy-undergoing-surgical-mitral-valve-intervention
#18
Kenya Kusunose, Nancy A Obuchowski, Marc Gillinov, Zoran B Popovic, Scott D Flamm, Brian P Griffin, Deborah H Kwon
BACKGROUND: Ischemic mitral regurgitation is associated with substantial risk of death. Although surgical mitral valve intervention (MVi) may improve symptoms, it has not been shown to improve survival. The aim of this study was to identify predictors of mortality in patients with ischemic mitral regurgitation and MVi. METHODS AND RESULTS: We evaluated 117 consecutive patients (age, 65±10 years) with advanced ischemic cardiomyopathy who underwent cardiac magnetic resonance and subsequent MVi between January 1, 2002 and January 1, 2012...
November 17, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29148068/gastrodin-protects-myocardial-cells-against-hypoxia-reoxygenation-injury-in-neonatal-rats-by-inhibiting-cell-autophagy-through-the-activation-of-mtor-signals-in-pi3k-akt-pathway
#19
Xiang Li, Qinhui Zhu, Yuanyuan Liu, Zhiyong Yang, Bin Li
OBJECTIVES: This study aimed to investigate the protective effect of gastrodin (GAS) on myocardial cells with hypoxia/reoxygenation (H/R) injury in neonatal rats and explore the underlying mechanism. METHODS: Myocardial cells were extracted from neonatal rats and divided into six groups: control, H/R, H/R + Low-Concentration GAS, H/R + Middle-Concentration GAS, H/R + High-Concentration GAS and H/R + High-Concentration GAS + AKT Inhibitor groups. After 48-h treatment, cell viability, autophagosome quantity and the expression levels of LC3-II, p62, Akt, pAkt, mammalian target of rapamycin (mTOR) and uncoordinated 51-like kinase 1 (ULK1) in myocardial cells were made comparisons among each group...
November 17, 2017: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/29143226/aligned-ovine-diaphragmatic-myoblasts-overexpressing-human-connexin-43-seeded-on-poly-l-lactic-acid-scaffolds-for-potential-use-in-cardiac-regeneration
#20
Carlos Sebastián Giménez, Paola Locatelli, Florencia Montini Ballarin, Alejandro Orlowski, Ricardo A Dewey, Milagros Pena, Gustavo Abel Abraham, Ernesto Alejandro Aiello, María Del Rosario Bauzá, Luis Cuniberti, Fernanda Daniela Olea, Alberto Crottogini
Diaphragmatic myoblasts (DMs) are precursors of type-1 muscle cells displaying high exhaustion threshold on account that they contract and relax 20 times/min over a lifespan, making them potentially useful in cardiac regeneration strategies. Besides, it has been shown that biomaterials for stem cell delivery improve cell retention and viability in the target organ. In the present study, we aimed at developing a novel approach based on the use of poly (L-lactic acid) (PLLA) scaffolds seeded with DMs overexpressing connexin-43 (cx43), a gap junction protein that promotes inter-cell connectivity...
November 15, 2017: Cytotechnology
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